It's my opinion that the dragon is not difficult, and honestly does not even pose a threat.
After I killed my dragon I felt some remorse...what did he do to me? Nothing!
So I will make a new map and adopt the next dragon.
I have a few questions though...can it fly through anything? Does it break the blocks it flys through? I heard this was the case...so I need to prepare. I want to build a cage around him, or platforms where I could stand where he wouldn't be able to damage me, in case I have friends who want to visit him too.
One does not simply capture a dragon with a cage, they use a dimension, when they did they called it they end, after they did imprison it their civilization fell and their people were corrupted by the power of their portal and moved into the dragons world, some even still walk the earth, at there core they hate what has come of them so if you look them in the eyes they will attack you, should you kill one they will drop half of the key to the dragons dimension.